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Total Capital and Net Income Per Unit (Details 1)
12 Months Ended
Dec. 31, 2011
Unitholders [Member]
 
Quarterly Distribution Target Amount (per unit)  
Minimum quarterly distribution of $0.4125 98.00%
Up to $0.4625 98.00%
Above $0.4625 up to $0.5375 85.00%
Above $0.5375 up to $0.65 75.00%
Above $0.65 50.00%
General Partners [Member]
 
Quarterly Distribution Target Amount (per unit)  
Minimum quarterly distribution of $0.4125 2.00%
Up to $0.4625 2.00%
Above $0.4625 up to $0.5375 15.00%
Above $0.5375 up to $0.65 25.00%
Above $0.65 50.00%